www/.htaccess bad match

updating the training-manuals section by adding the trailing slash for
the source and target. should fix the subdir match error with the trailing slash
gets matched and doesnt get included on the redirect target.

Change-Id: Ia366f50e6b5e7e8890ff0ba0b66eb19029c06263
Closes-Bug: #1255773
Merge "www/.htaccess bad match"